A network connected to the Internet but isolated from the Internet is called as a private network.Centralized processing is performed in one computer or in a cluster of computers in a single location.When more than one computer or processor is used to execute an application it is called as a distributed processing.The combination of centralized processing model and distributed processing model is called the client-server model.Radio Frequency (RF) is the wireless communication technology which uses electromagnetic waves used in radio communication to transmit and receive data.The part of the electromagnetic spectrum corresponding to radio frequencies is called as the radio frequency spectrum.Electromagnetic waves with wavelengths longer than those of infrared light, but shorter than those radio waves are called microwaves.
When the information been sent is transmitted over a frequency band which is much wider than the minimum bandwidth needed to send that information then it is called as a spread spectrum.
A computer networking device that forwards data packets towards its destination is called as a router.The process of transferring data across an Internetwork from a source host to a destination host is called as routing.
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